<td colspan="2">
    <form method="POST" action="/index.php/<?= $class; ?>/">
        <select name="selector">
            <option value="0">Выберите</option>
            <?
            foreach ($content AS $item):
                ?><option value=<?= $item['ID'] ?>><?= $item['TITLE'] ?></option><?
        endforeach;
            ?>
            </selector>
            <input type="button" onclick="this.form.action += this.form.selector.value; this.form.submit();" />
    </form>
</td>